Apparatus for making sound records



June 24, 1930. H; KUQHENMEISTEm I 5 3 APPARATUS FOR MAKING SOUND RECORDS Filed Dec. 15, 1927 Patented June 24," 193 Y UNITED STAT HEINRICH KUCHENHEISIEB, 0F BERLIN, GERMANY APPARATUS FOR MAKING SOUND RECORDS Application filed December 15, 1927, Serial No.

My invention relates to apparatus for making .sound records, and it is an object of my invention to provide an apparatus of this typein which the influence of the nat-.

5 ural vibrations of the controlling means for the recording part is eliminated;

,To this end I provide a single sound recording element in combination with any number of sound receivers. To each receiver I allot a controlling unit, and intermediate each controlling unit and the single recording element I provide means for independently, simultaneously and directly influencing the single recording element.

Records of any kind may be made with my improved apparatus, as record plates, films,magnetic strips, magnetic wires, etc., and any kind of receiver may be provided, as theusual horns, microphones, cathodo- 2o phones,etc. a a Apparatus in which impulses from several receivers having, if desired, independent amplifiers and re ators, are transmitted to a common device for recording all impulses throughthe medium of a single electromagnet, have already been proposed. This type of apparatus involves the drawback that the electromagnet and the diaphragm with which it cooperates, possesses an a natural vibration and therefore render more distinctly sounds in the vicinity of their resonance pitch. Such apparatus are not in anyway an improvement over the old apparatus having but a single receiver. In my invention, on the other hand, not less than two controlling units each receivin impulses from a separate receiver'or recelvers, act on the recording part which is provided with means for making impres- 4o sions on the record.

I may also connect any of the controlling units inparallel or in series, or make some of them larger or smaller than the rest, so as to diflerentiate their influence onthe recording part.

Natural vibration of the reco art may be eliminated by preferably frictlonless, damping means.

With my improved apparatus, I am able to 113001111 separately the effect of a group of 244L327, and in Germany December 15, 1928.

instruments, as the violins, the flutes, etc., of a band playing. In the drawings, an apparatus for mechanical and photographic recording are illustrated diagrammatically by way of example in Figs. 1 and 2, respectively.

Referring first to Fig. 1, a is a stylus on the recordingv element here shown as a b one shaft 0, d, (P, d are armatures on the disc I which are acted on by electromag- 50 net cores 6, 0 ,0 respectively. The armatures may be constructed as bands under tension, not shown, which in their normal position tend to hold the disc 6 in its neutral position. L The electromagnets e trolling units and the coil of each is connectedwith a' set of binding posts f, and

f which in turn receivers, not shown, and if any. I I

g, g are strong electromagnets which are connected to a battery or the like at f and equipped with cores which surround are connected with sound the r amplifiers,

the d1sc 1). They serve for damping the vibrations of the disc 6 which may be of aluminium and prevent independent vibration of the disc. Their action may be regulated by resistances, not shown in their circuits.

The variations of current in the electro- 30" magnets e which are brought about by the sound receivers, cause the disc 6 to rock about its axis as the attraction is increased or reduced, and cor n I movement is imparted to the stylus a. When the disc is moving in the magnetic fields of the magnets g, 2 eddy currents setup in the disc '5 which amp its movements and preventrocking of the disc when the current impulses have ceasedy p The coils of the electromagnets e are exchangeable in order toadapt them to the v character of the sounds to be recorded as to their resonance. As the i erties of the electromagnets are different, accentuation of a given resonance by' fthe apparatus is prevented, the more natural vibrations are damped out by the magnets g, g.

65 are the con- -in the controlling 0o resonance prop; o5

Preferably, the axis about which the disc b is rocking is in its centre of gravity, and means, not shown, such as springs, are provided for holding the disc in its neutral position.

Referring now to Fig. 2, the units e' e are pairs of electromagnets which con-- trol a mirror a in the 100 of an oscillograph k. A ray of light is projected on the mirror a from a lamp p and a system of lenses 9, and reflected on. a sensitized film t through a lens 1'. The film is moving on a rollers and is imprinted with a curve with separate sound receivers l, 1

u by the spot of lightfrom the mirror a and the lens T which when the film is developed, appears as a dark line.

The controlling units are independentfas in the previous example, and are connected Z and with amphfiers m, 112?, m

The action of the electromagnet pairs 6 e and e in. the loop k varies under the influence of the current variations efi'ected by-the'three michophones or sound receivers Z 1 and Z and magnifiedby the amplifiers rm m and mi, and the mirror a rocks in proportion to the variations of the sound re- ;ceived at the microphones. In consequence, the light issuing from the lamp 1) and reflected onto the film t bythe mlrror a will mark on the film a curve at which exactly ii of controlling units, as the units can be g, for damping the natural vibrations in a manner similar to that shown in 1.;

I am not limited to any. partic ar type erated by static or electrostatic vibrators,

ords comprising a movable recording ele-' V ph loop, a plurality of controlling units- .pneumatlc, or any other suitable means.

I claim s 1. An apparatus for maln'ng sound recment including a mirror and 'an oscilloor said recording element, a soundreceiver connected with each unit, means for projectlight on said mirror, means for mov- 7 ing a sensitized film past said mirror insuch a manner as to be struck by the light reflected'by said mirror and means intermediate .each controll' unit and said recording element forin ependently, simultaneously and directly influencing said sin,- gle recording element.

2. An apparat for making sound records comprising a single sound recording j element, a plurality o influencing said single recor e'lement,a plurality ofisound" receivers, a

controlling unit allotted to each receiver, and means intermediate each controlling unit and said recording element for independently, simultaneously and directly influencing said single recording element.

3. An apparatus for making sound records comprising a single sound recording controlling unit allotted to each receiver, an amplifier interposed between each receiver 'and its controlling unit,'a'nd means interunit and said remediate each contro cording element for in ependently, simultaneously and directly influencing said sin gle recording'element. 1

4. An apparatus for making sound records comprising a sin le sound recording element, a plurahty 0 sound receivers, a

controlling unit allotted to each receiver,

sound receivers, a

said units being connected in parallel, and 7 means intermediate each controlling unit and said recording element for inde endent- -ly, simultaneously and directly in uencing saidsingle recording element.-

for making sound rec- I 5. An apparatus ords comprising a S111 le sound recording element, a plurality 0 sound receivers, a

controlling unit allotted to each receiver, said units being of various sizes, and means intermediate said controlling unit and said recording element for independently, simultaneously and directly influencing "said single recording element.

6. An apparatus for making sound records comprising a single sound recording element, means for moving a record past said recording element, a plurality of sound receivers a controlling unit allotted to each receiver, and means intermediate eachcontrolling unit and said recording element for independently, simultaneously and directly influencing said single recordlng element.

7. An apparatus or making sound records comprising a single sound recording element, means for damping the movements of said recording element, a plurality of sound receivers, a controlling unit allotted to each.

receiver, and means intermediate each controlling unit and said recording element for I element. In testimony whereof I aflix my signature.

HEINRICH KUG ENMEISTER.

independently, simultaneously and directly 

